JPS60182382A - Scroll compressor - Google Patents

Abstract

PURPOSE:To obviate the necessity of an Oldham's apparatus and facilitate working by shifting the projection part formed on a scroll in contact with the inner peripheral surface of a circular groove formed onto a frame, during the revolution of a turning scroll, thus preventing the rotation of the scroll. CONSTITUTION:Since, during the revolution of a turning scroll 5, two projection parts 24 of the scroll 5 shift in contact with the inner peripheral surface of a circular groove 5 on a frame 16, rotation is prevented during revolution. Therefore, the necessity of an Oldham's coupling in the conventional can be obviated. Since the contact surface between the projection part 24 and the inner periphery of the circular groove 25 is linear contact and circular contact, the resistance is little, and the smooth revolution of the turning scroll 5 can be obtained, and compression efficiency can be improved. Further, the works for the projection part 24 and the circular groove 25 are enough, and working and preparation are facilitated.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a scroll compressor that includes a fixed scroll and an orbiting scroll, and in particular, to a scroll compressor that is composed of a fixed scroll and an orbiting scroll, and in particular, to This invention relates to a scroll compressor with an improved mechanism for preventing 1.

[Technical background of the invention and its problems] Recently, Suffolk compressors have been increasingly used in refrigeration cycles. A scroll compressor is a fixed scroll formed in a vortex shape such as an involute, and an orbiting scroll that are engaged with each other at a position rotated by a certain angle. By rotating the scroll while maintaining the same, the refrigerant is sucked and compressed almost continuously in the vortex between the fixed scroll and the orbiting scroll.

This scroll compressor will be explained in detail with reference to FIGS. 1 and 2.

An electric element 2 is provided at the bottom of the case 1, and a scroll compression element 3 is provided at the top.The compression element 3 consists of a fixed scroll 4 and an orbiting scroll 5, and is shown in FIGS. 3 and 4. Shown J: Fixed scroll 4 formed in a spiral shape such as an involute, and a rotating scroll shaped like a spiral [
The orbiting scroll 5 is attached to a fixed block [
] - The orbiting scroll is installed in mesh with the fixed scroll 4 at a position rotated by 180 degrees with respect to the scroll 4, and the orbiting scroll is rotated while maintaining a constant eccentric radius r5, with the center 05 of the orbiting scroll 5 relative to the center 04 of the fixed scroll 4. 5 revolves around the center 04 of the fixed scroll 4. For example, if the fixed scroll 4 and the orbiting scroll 5 are right-handed spirals as shown in FIGS. 3 and 4,
When the orbiting scroll 5 is rotated clockwise from the electric element 2 shown in the figure via the crankshaft 6, a vortex 4a of the fixed scroll 1]-rule 4 and a vortex 5a of the orbiting scroll 5 form a structure. The refrigerant in the compression chamber 7 is sequentially passed through the vortex section 4a,
5a and toward the center of the vortex and is compressed. In other words, the refrigerant gas 8 in the dotted area in FIG.
Assuming that the rotating shaft [1-5 revolves 180 degrees as shown in FIG. Compressed by

Therefore, as shown in FIG. 1, the refrigerant from the suction pipe 9 is transferred to the suction 1 of the outer cylinder 1b of the fixed valve 1-1-1 shown in FIG.
] 10, it enters between the vortices 4a and 5a of the fixed scroll II-roll 4 and the rotating scroll 5, and moves to the center of the vortex sections 4a and 5a while being compressed between the grooves, and the fixed scroll 4 It is discharged into the case 1 from the central discharge port 11 of the upper M4G.

In this case, the orbiting scroll 5 always rotates 180 degrees with respect to the fixed frame 4 and is at the IC position, that is, the orbiting scroll 5 does not rotate around its center 05 during the revolution of the orbiting scroll 5. It will be done like this.

Conventionally, the rotation prevention 11- of the orbiting scroll 5 is performed by an Oldham joint 12, and the orbiting scroll 5 is rotated by moving only in the X-axis and Y-axis directions as shown in FIGS. 3 and 4. Scroll 5 revolves without rotating. J: It's like a sea urchin. That is, as shown in FIG. 2, the lower surface of the rotary scroll 5 is provided with a sliding groove 13 along, for example, the X-axis direction, and the Oldham joint 12 is provided with a sliding groove 13 that is engaged in the sliding groove 13. The frame 16 that supports the fixed scroll 4 and the orbiting scroll 5 is provided with a sliding groove 15 along the Y axis shown in FIGS. The other surface of the joint 12 is formed with a pawl 17 that engages with and slides on this sliding groove 15, and allows the Oldham joint 12 to slide the orbiting scroll 5 on the reframe 16 in the X-axis and Y-axis directions. It is designed to rotate.

However, the Oldham joint 12 moves the orbiting scroll 5 to
Since it rotates while sliding on the axis and the Y axis, the sliding resistance is large, and precision machining is required during manufacturing.

[Object of the Invention] The present invention has been made in consideration of the above circumstances, and it is possible to prevent the rotation of an orbiting scroll without using an Oldham joint, and it also has a scroll compression method that has low sliding resistance (and is easy to manufacture). It provides an opportunity for

[Summary of the Invention] The present invention provides a fixed scroll and an orbiting scroll formed in the same spiral shape on a frame, and the orbiting scroll is engaged at a position rotated by a certain angle with respect to the fixed scroll. In a scroll compressor which is arranged to rotate at 4T while maintaining an eccentric radius with respect to the center of a fixed scroll, at least two protrusions are provided on the orbiting scroll or frame side, and the other frame or orbiting scroll is provided with at least two protrusions, It is characterized by having a circular groove that accommodates the protrusion and contacts the protrusion of the moth during the revolution of the orbiting scroll to prevent the orbiting scroll from rotating. The protrusion provided on the frame (or the orbiting scroll) moves while contacting the inner peripheral surface of the circular groove provided on the frame (or the orbiting scroll), thereby preventing the orbiting scroll from rotating. This eliminates the need for the conventional Oldham joint, and since it has a protrusion and a circular groove, it is easy to process.

[Embodiments of the Invention] A preferred embodiment of a scroll compressor according to the present invention will be described below with reference to the accompanying drawings.

The configuration of the fixed scroll 4 and the orbiting scroll 5 is -〇
- As explained in the conventional example of FIGS. 1 to 4.

In FIG. 5, a mounting portion 19 of the fixed scroll 4 is joined onto the V-end peripheral portion 18 of the frame 16 and supported by bolts or the like. Furthermore, a groove 20 for rotatably supporting the lower cover 5G of the orbiting scroll 5 is provided on the upper surface of the frame 16. A cylindrical bearing portion 21 that fits into the upper end of the crankshaft 6 is provided on the lower surface of the orbiting scroll 5 on the frame 16 side. Inside the frame 16, this bearing portion 21 and an eccentric portion 6 at the upper end of the crankshaft 6 that is fitted into this bearing portion 21 are provided.
A and a hole 22 for accommodating the balance weight 6b are formed, and a bearing part 23 is provided at the lower part of the frame 16 to rotatably support the crankshaft 6 at the lower part of the balance weight 6b.

Column-shaped protrusions 24 facing each other are protruded from the lower surface of the lower i5G of the orbiting scroll 5 on the frame 16 side, and the protrusions 24 are provided on the surface 20a of the groove 20 of the frame 16 as shown in FIG. A circular groove 25 is formed which accommodates the projection 24 and is in constant contact with the protrusion 24 during the revolution of the orbiting scroll 5. The inner diameter of this circular groove 25 is 0, where d is the inner diameter of the projection 24 and r5 is the eccentric radius of the orbiting scroll 5.
=2rr, +1/2d. In addition, the protrusion 24 is located on the lower lid 5.
A may be provided with a hole 26 and the protrusion 24 may be press-fitted therein, or a screw may be formed in the hole 26 and screwed into the hole 26.

Next, the present invention will be explained in detail.

Due to the rotation of the crankshaft 6, the orbiting scroll 5 engages with the fixed scroll 4 and revolves around the center 04 of the fixed scroll 4 while maintaining an eccentric radius r5 with respect to the center 04 of the fixed scroll 4, as described above. A refrigerant or the like is sucked and compressed in the compression chamber 7 between the wet parts 4a and 5a.

In this case, the two protrusions 24 of the rotating frame 1''-le 5 move while contacting the inner circumferential surface of the circular groove 25 on the frame 16, so that rotation of the frame 16 is prevented during revolution. The contact surface between the protrusion 24 and the inner periphery of the circular groove 25 is a line contact and a circular contact, so the resistance is small and the orbiting scroll 5 can revolve smoothly.

Although an example has been shown in which two protrusions 24 and two circular grooves 25 are provided facing each other, it goes without saying that two or more may be provided.

[Modified Embodiment] Figure 7 shows a modified embodiment of the present invention.
A protrusion 24 is provided on the frame 16 side, and the orbiting scroll 5
A circular groove 25 is provided on the side to prevent the orbiting scroll 5 from rotating. In addition, a bypass hole 27 communicating with the compression chamber 7 is provided in the upper lid 4G of the fixed sleeve 1, and a plate-shaped bypass valve 29 is attached to the bypass hole 27 with bolts 28 or the like. The bypass hole 27 is positioned so as to communicate with the compression chamber 7 which is in the middle of the compression process from the suction port to the discharge port 11. Further, a discharge cover 30 is provided on the outside of the fixed scroll 4 to temporarily store the refrigerant discharged from the discharge port 11 of the fixed scroll 4.
! 1 Install the outlet pipe 31.

In this example, at the time of startup, the refrigerant in the compression chamber 7 escapes from the bypass hole 27 via the bypass valve 29, so the load at the time of startup is reduced. Also, during operation, the pressure of the refrigerant gas discharged into the discharge cover 30 is high, so the bypass valve 29 is closed, so the compression chamber 7
Although the refrigerant is not bypassed through the bypass hole 27, liquid refrigerant etc. enters the compression chamber 7 and becomes overcompressed.
If the pressure inside the IC becomes higher than the pressure inside the discharge cover 30, the refrigerant in the compression chamber 7 is bypassed to prevent overcompression.
Can be done.

[Effects of the Invention 1 As is clear from the above detailed description, the present invention exhibits the following excellent effects.

(1) A protrusion is provided on the orbiting scroll or frame side, and the protrusion in A is housed in the frame or orbiting scroll,
In addition, since a circular groove is provided that contacts the protrusion of the orbiting scroll while it revolves and prevents the orbiting scroll from rotating, the conventional Oldham joint is no longer necessary.

(2) The protrusion moves in contact with the inner peripheral surface of the circular groove.
Therefore, the contact resistance is small, making it possible to reduce the input power and improve the compression efficiency.

(3) Processing of the protrusion and the circular groove is all that is required, making machining and manufacturing easy.

10-

[Brief explanation of the drawing]

Figure 1 is a cross-sectional perspective view showing the entire conventional scroll compressor, Figure 2 is a cross-sectional perspective view of the main part of Figure 1, and Figure 3 is the relationship between the fixed scroll and orbiting scroll of the scroll compressor. FIG. 4 is a diagram showing the orbiting scroll of FIG. 3 having revolved 180 degrees, and FIG.
- A cross-sectional view of the main parts showing one embodiment of the compressor;
FIG. 7 is a cross-sectional view of main parts showing another embodiment of the scroll compressor according to the present invention. In the figure, 4 is a fixed scroll, 5 is an orbiting scroll, 16 is a frame, 24 is a projection, and 25 is a circular groove. Patent applicant Tokyo Shibaura Electric Co., Ltd. Patent attorney Nobuo Kinutani 11- Figure 3 Figure 4 Figure 5 Figure 5 5a 7 4 4c 4a JP-A-182382 (5) Figure 6 Figure 7

Claims (1)

[Claims] On the frame, a fixed scroll and an orbiting scroll are formed in the same spiral shape, and the orbiting scroll is engaged at a position rotated by a certain angle with respect to the fixed scroll, and eccentric with respect to the center of the fixed scroll. In a scroll compressor that is arranged to revolve while maintaining a radius, at least two protrusions are provided on the orbiting scroll or the frame, and the other protrusion is housed in the frame or the orbiting scroll, and A scroll compressor characterized by having a circular groove that comes into contact with a protrusion to prevent rotation.